diff --git a/koch.nim b/koch.nim
index b50b6c0e13..7059e87a58 100644
--- a/koch.nim
+++ b/koch.nim
@@ -75,7 +75,7 @@ Web options:
 """
 
 let kochExe* = when isMainModule: os.getAppFilename() # always correct when koch is main program, even if `koch` exe renamed eg: `nim c -o:koch_debug koch.nim`
-               else: getAppDir() / "koch " # `best effort`, works for ur particular use case in nightly
+               else: getAppDir() / "koch".exe # works for winrelease
 
 proc kochExec*(cmd: string) =
   exec kochExe.quoteShell & " " & cmd